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arXiv · 1212.5136

In situ measurements of Krypton in Xenon gas with a quadrupole mass spectrometer following a cold-trap at a temporarily reduced pumping speed

Ethan Brown·Stephan Rosendahl·Christian Huhmann·Christian Weinheimer·Hans Kettling
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Abstract

A new method for measuring trace amounts of krypton in xenon using a cold trap with a residual gas analyzer has been developed, which achieves an increased sensitivity by temporarily reducing the pumping speed while expending a minimal amount of xenon. By partially closing a custom built butterfly valve between the measurement chamber and the turbomolecular pump, a sensitivity of 40 ppt has been reached. This method has been tested on an ultra-pure gas sample from Air Liquide with an unknown intrinsic krypton concentration, yielding a krypton concentration of $330 \pm 200$ ppt.

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Ethan Brown, Stephan Rosendahl, Christian Huhmann, Christian Weinheimer, Hans Kettling. 2012-12-20. In situ measurements of Krypton in Xenon gas with a quadrupole mass spectrometer following a cold-trap at a temporarily reduced pumping speed. https://doi.org/10.1088/1748-0221/8/02/p02011

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